/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.code.motoo.codec.textline;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;

import com.google.code.motoo.codec.ProtocolEncoder;
import com.google.code.motoo.codec.ProtocolEncoderOutput;
import com.google.code.motoo.core.IoBuffer;
import com.google.code.motoo.core.IoSession;

/**
 * 
 * @author linfengqi
 * @version 1.0  May 13, 2009
 */
public class TextLineEncoder implements ProtocolEncoder {
	
	private CharsetEncoder encoder;
	private byte[] delimit;

	public TextLineEncoder(Charset charset, LineDelimiter delimiter) {
		this.encoder = charset.newEncoder();
		this.delimit = delimiter.getValue().getBytes();
	}
	
	public TextLineEncoder(Charset charset, String delimiter) {
		this(charset, new LineDelimiter(delimiter));
	}

	public void encode(IoSession session, Object message, ProtocolEncoderOutput out) throws Exception {
		if (message == null || !(message instanceof String)) return;
		String str = (String) message;
		ByteBuffer block = encoder.encode(CharBuffer.wrap(str));
		int newSize = block.limit() + delimit.length;
		IoBuffer result = IoBuffer.allocate(newSize);
		result.put(block);
		result.put(delimit);
		result.flip();
		out.write(result);
	}
	
	public void dispose(IoSession session) throws Exception {

	}

}
